rolling road day this weekend

[daytona365]

Originally Posted by stamford

I feel another 'do stuff meet' on the horizon!

I can come and get my gloves and rags back lol................ mmmm now what needs doing on mine??????????

[redzed]

been looking at results from previous rolling road sessions, amazing what different results you can get, that last session i did on a different zs was:

189bhp @ the fly (which is calculated)
and it was only 150bhp @ the wheels (actual measurement),

the one yesterday on my red zed which feels much faster was:
182 bhp @ the flywheel (calculated)
and 172bhp @ the wheel (measured)

Surely the only measurement which actually counts is bhp @ wheels as its the actual measurement rather than calculated which is at best just a guess, just some thoughts

[petet16]

@ wheels figures are more relevant imo, but the fly figure gives a clue to transmission losses which are interesting to use for comparison purposes.

[peterzs]

Some pics of the event, Redzed has a racing blue one as well, so start with his.







Dans, such a improvement from when I first saw it, just after Dan picked it up, just shows, bit of TLC and its a different car.







My one.





And Rich's and just cos they are cheap, can still suprise on how good they go and sound.



And hiding round the side is Stamfords, mighty Vauxhall Estate.



Was a great day, thanks againg to Rich and his colleague who did all the tying down and a bit of spanner work on my injectors, trying to stop a bit of a derv blow. Plus the tea/coffee/biscuits they laid on, kept us all going.

[MickUK]

Someone PM me next time!!

Good pics!

[peterzs]

Will do

[kitch]

Hadn't spotted this thread!

Thanks to all who came, and like I said in the events one - the £25 a run offer is a rolling one (geddit? rolling?) to those who attended Saturday.

Rich

[peterzs]

Thanks Rich, I'll sort the injectors and see when Dan is thinking of coming down in his mended red one!!!!

[Craig-ZS180]

So what would others be looking to pay for the same session? I had to pull out a couple of weeks ago due to other commitments so dont expect to be in the same area of pricing but I didnt drop out at the last minute as said early on things had changed on my part.
Really am gutted I couldnt get there as the pics do look good and looks like was a good laugh there.
Well done Rich for putting the effort in to organise it.

[MG mad]

Originally Posted by redzed

been looking at results from previous rolling road sessions, amazing what different results you can get, that last session i did on a different zs was:

189bhp @ the fly (which is calculated)
and it was only 150bhp @ the wheels (actual measurement),

the one yesterday on my red zed which feels much faster was:
182 bhp @ the flywheel (calculated)
and 172bhp @ the wheel (measured)

Surely the only measurement which actually counts is bhp @ wheels as its the actual measurement rather than calculated which is at best just a guess, just some thoughts

It's possible to measure the actual losses on run down to get a measured flywheel figure. Your first dyno run, with 189 bhp calculated from 150 would indicate transmission loses of 26%, which is quite high for a FWDer. On the other hand, the 5.8% of your second run is unrealistically low - 15-20% is more likely. That would put 150 bhp at the wheels at around standard 180 bhp, and 172 bhp at the wheels more like 200 at the fly. Of course different dynos on different days, it's almost pointless comparing the two.